SwitchRes is a little utility, built around a Control Strip module, that will allow you to switch the resolution of all your monitors. SwitchRes already incorporates features from the Monitor Resolution, Monitor BitDepth, and Video Mirroring Control Strip Modules bundled with your system.
Version 2.5.2 fixes the following:
- SwitchRes no mores displays the "1x1" resolution in the list
- Solved a bug with MacPortrait driven monitors
System 7.5 or later, Control Strip Module.